linux-kernel - RE: [EXT] Re: [PATCH net-next v2 4/4] net: mvpp2: 2500baseX support

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Date:   Wed, 3 Jan 2018 15:50:35 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Andrew Lunn <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kishon@...com" <kishon@...com>,
        "gregory.clement@...e-electrons.com" 
        <gregory.clement@...e-electrons.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        Yan Markman <ymarkman@...vell.com>,
        "thomas.petazzoni@...e-electrons.com" 
        <thomas.petazzoni@...e-electrons.com>,
        "miquel.raynal@...e-electrons.com" <miquel.raynal@...e-electrons.com>,
        Nadav Haklai <nadavh@...vell.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH net-next v2 4/4] net: mvpp2: 2500baseX support



> -----Original Message-----
> From: Antoine Tenart [mailto:antoine.tenart@...e-electrons.com]
> Sent: Wednesday, January 03, 2018 5:32 PM
> To: Andrew Lunn <andrew@...n.ch>
> Cc: Antoine Tenart <antoine.tenart@...e-electrons.com>;
> davem@...emloft.net; kishon@...com; gregory.clement@...e-electrons.com;
> linux@...linux.org.uk; mw@...ihalf.com; Stefan Chulski
> <stefanc@...vell.com>; Yan Markman <ymarkman@...vell.com>;
> thomas.petazzoni@...e-electrons.com; miquel.raynal@...e-electrons.com;
> Nadav Haklai <nadavh@...vell.com>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH net-next v2 4/4] net: mvpp2: 2500baseX support
> 
> External Email
> 
> ----------------------------------------------------------------------
> Hi Andrew,
> 
> On Wed, Jan 03, 2018 at 04:20:36PM +0100, Andrew Lunn wrote:
> > > @@ -4612,6 +4616,9 @@ static int mvpp22_comphy_init(struct
> mvpp2_port *port)
> > >  	case PHY_INTERFACE_MODE_1000BASEX:
> > >  		mode = PHY_MODE_SGMII;
> > >  		break;
> > > +	case PHY_INTERFACE_MODE_2500BASEX:
> > > +		mode = PHY_MODE_2500SGMII;
> > > +		break;
> >
> > I think this is the source of confusion with linux/phy.h and
> > linux/phy/phy.h.
> >
> > What would PHY_INTERFACE_MODE_2500SGMII use?
> >
> > Where is this all getting confused? Should the caller to
> > mvpp22_comphy_init() actually be passing
> PHY_INTERFACE_MODE_2500SGMII?
> > What is the MAC actually doing at this point? 2500BASEX or 2500SGMII?
> 
> PHY_INTERFACE_MODE_2500BASEX is the PHY mode whereas
> PHY_MODE_2500SGMII is the mode used by the common PHY driver (i.e. the
> one configuring the serdes lanes).
> 
> There's no PHY_INTERFACE_MODE_2500SGMII mode.
> 
> > At minimum there needs to be a comment that this is not a typ0,
> > otherwise you are going to get patches submitted to 'fix' this.
> 
> Sure, I can add a comment to state this function is a translation between the
> net PHY mode and the generic PHY mode (it's a n-to-1 translation).
> 

Maybe we should rename enum phy_mode to comphy_mode and PHY_MODE_2500SGMII to COMPHY_MODE_2500SGMII.
Since this enum set MAC to PHY serdes communication mode, not PHY to PHY communication mode.

Stefan.